Import Data in the Graph Data window read the whole picked file into
memory before cutting its rows and columns to the graph's limits. It now
reads at most one byte past 1 MB (1,048,576 bytes, the limit Import Data
Sets uses) where the host can read part of a file, and refuses a larger
file with "the file is larger than 1 MB", which every complete catalog
already translates. The sheet is left as it was.
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